Analysis of the Damage Quantity of Buckling Restrained Braces under Earthquake Action

2013 ◽  
Vol 838-841 ◽  
pp. 1609-1612
Author(s):  
Pei Jiang Pan
Keyword(s):  
Design Method ◽  
Time History ◽  
Calculation Model ◽  
Frame Structure ◽  
Practical Calculation ◽  
Dissipation Energy ◽  
History Analysis ◽  
Buckling Restrained Braces ◽  
Earthquake Action ◽  
Dynamic Time

The energy dissipation design method has received more attention by engineering circle. Nowadays, the buckling restrained braces (BRBs) are used in higher structures being dissipation energy components. So, it is very necessary to determine the damage quantity of BRBs under earthquake. Firstly, the meaning of the damage quantity of BRBs is clarified based on the energy theory. Secondly, a single degree of freedom analyses model which is suitable to the frame structure is proposed. The nonlinear dynamic time-history analysis of BRBs system is carried out by using FEMS software of ANSYS 11.0 and seismic response of BRBs is obtained. Finally, a practical calculation model of the Damage quantity of BRBs is established. Using MATLAB software, the Damage quantity of BRBs is obtained.

Irregular Structure of the Metal Energy Dissipation Wrest Resistant Performance Analysis

2011 ◽  
Vol 105-107 ◽  
pp. 818-822
Author(s):  
Xiao Fei Teng ◽  
Si Yang Chen ◽  
Bin Luo
Keyword(s):  
Time History ◽  
Frame Structure ◽  
Software Modeling ◽  
Element Analysis ◽  
Irregular Structure ◽  
History Analysis ◽  
Framework Model ◽  
Before And After ◽  
Integral Structure ◽  
Dynamic Time

To make a top local adding stories of “L” flat facade irregular frame structure with good resistance to twist and integrity, can better satisfy the requirements of local seismic fortification intensity,using metal damper to this after-adding-stories framework model for processing. Using SAP2000 finite element analysis software modeling and in its install metal damper dynamic time-history analysis before and after. Results show that the structure using metal consumption technology in consume earthquake input energy at the same time can enhance structure rigid and floor wrest resistant and strengthen the lateral stiffness integral structure seismic performance.

Comparison and Study on Seismic Performance of the Special-Shaped Column and Rectangular Column Frame Structure

2013 ◽  
Vol 405-408 ◽  
pp. 1110-1114
Author(s):  
Qin Peng ◽  
Yi Teng Huang ◽  
Yong Kun Luo
Keyword(s):  
Seismic Performance ◽  
Time History ◽  
Dynamic Structure ◽  
Frame Structure ◽  
Column Structure ◽  
History Analysis ◽  
Seismic Property ◽  
Earthquake Action ◽  
The Moment ◽  
Comparison And Study

By introducing the basic concepts and designing principles of special-shaped column structure, this paper attempts to establish three finite element models (the special-shaped column structure, rectangular column structure with the equal area and rectangular column structure with the moment of inertia) by using the SAP2000. And the basic dynamic structure properties of three structures are analyzed. It’s base of the dynamic analysis for the structure. Then, the paper analyzes the elastic seismic performance under the horizontal earthquake action by using the vibration spectrum method and the elastic time-history analysis method. The results show that three models are all in the elastic steps. We compared the anti-seismic property of three models under frequent earthquake.

A Practical Design Method for Energy Dissipation Structure

2012 ◽  
Vol 204-208 ◽  
pp. 1150-1153
Author(s):  
Min Chen ◽  
Guo Jing He ◽  
Chang Liu
Keyword(s):  
Energy Dissipation ◽  
Design Method ◽  
Damping Ratio ◽  
Time History ◽  
Structure Design ◽  
Frame Structure ◽  
Seismic Region ◽  
History Analysis ◽  
Dissipation Structure ◽  
Supplemental Damping

Energy dissipation structure is favored by designers because the earthquake energy can be dissipated by the dampers, which can avoid or reduce the damage caused by earthquake. However, the energy dissipation structure design is complex and the most domestic designers can not master it easily. In this paper, a simple and practicable design method for viscous damper dissipation structure by using the PKPM design software is proposed based on a 7-storey frame structure in highly seismic region. Firstly, lower half or one degree for the design intensity to design out an uncontrolled structure. Secondly, determine the supplemental damping ratio required for the fortification intensity via modal analysis method of PKPM software, and identify the numbers of the required dampers as well as their corresponding installation positions in line with the methods in the seismic code of China. Finally, the ETABS program is adopted to conduct the time-history analysis of the designed dissipation structure, showing that the proposed method in this paper can produce a satisfied result.

scholarly journals Dynamic Performance Analysis of Steel Frame Structure under Seismic Action

2019 ◽  
Vol 2 (2) ◽  
pp. 1
Author(s):  
Xiaojun Yuan ◽  
Yanmu Qu ◽  
Jinlong Liu ◽  
Kailin Wei ◽  
Haifeng Zong
Keyword(s):  
Dynamic Performance ◽  
Time History ◽  
Steel Frame ◽  
Frame Structure ◽  
Seismic Action ◽  
Element Analysis ◽  
History Analysis ◽  
Dynamic Time ◽  
Steel Frame Structure ◽  
Dynamic Performance Analysis

In order to find out the dynamic characteristics of a steel frame structure project in the 8 degree (0.3g) area, the artificial wave, Taft wave and El Centro wave were input by using the finite element analysis software ANSYS. The dynamic time-history analysis of the structure shows the dynamic performance of the structure under the frequent earthquakes and rare earthquakes.

The Seismic Response of a 1:3 Scale Model R.C. Structure with Elastomeric Spring Dampers

1995 ◽  
Vol 11 (2) ◽  
pp. 249-267 ◽  
Author(s):  
Gokhan Pekcan ◽  
John B. Mander ◽  
Stuart S. Chen
Keyword(s):  
Reinforced Concrete ◽  
Seismic Response ◽  
Structural Response ◽  
Time History ◽  
Shaking Table ◽  
Frame Structure ◽  
Scale Model ◽  
History Analysis ◽  
Analysis Computer ◽  
Dynamic Time

In this experimental study, elastomeric spring dampers, which have a distinct re-centering characteristic, are used to retrofit a non-ductile, previously damaged 1/3 scale model reinforced concrete building frame structure which is subjected to a variety of ground motions in shaking table tests. A velocity dependent analytical model is developed and verified for the elastomeric spring dampers. This model is implemented in the widely available non-linear dynamic time history analysis computer program DRAIN-2DX to produce response predictions which are in good agreement with experimental observations. The elastomeric spring damper devices significantly attenuate the seismic response of the structure and provide a considerable amount of energy dissipation while the main non-ductile reinforced concrete structural load carrying elements remain elastic. The effect of varying the damper configuration on the structural response was also investigated.

Study on Seismic Response Characteristics of Step-Terrace Frame Structure on the Slope

2014 ◽  
Vol 580-583 ◽  
pp. 1718-1722
Author(s):  
Li Ping Liu ◽  
Ji Jin Liu ◽  
An Liang Li ◽  
Ming Zi Tan
Keyword(s):  
Seismic Response ◽  
Soil Structure ◽  
Time History ◽  
Frame Structure ◽  
Soil Structure Interaction ◽  
Soil Parameters ◽  
Structure Interaction ◽  
Response Characteristics ◽  
History Analysis ◽  
Dynamic Time

The seismic response of step-terrace frame structure is affected by the slope. Considered soil parameters of slope, the floor numbers and span numbers of layers below the scarp, 45 step-terrace frame example structures were designed, and three excitations at bedrock were selected to analyze the example structures response with dynamic time-history analysis method. The research indicates that when the other conditions are the same, the soil becomes softer, or structure's span numbers on the slope becomes larger or the slope becomes higher, the dynamic interaction between slope and step-terrace frame structure becomes more obvious. When the inputted ground motion at slope foot is adopted and the slope soil is soft, the seismic response of structure without soil-structure interaction is smaller than that of with soil-structure interaction.

scholarly journals Seismic Retrofit of an Existing Reinforced Concrete Building with Buckling-restrained Braces

2021 ◽  
Vol 15 (1) ◽  
pp. 203-225
Author(s):  
Massimiliano Ferraioli ◽  
Angelo Lavino ◽  
Carmine Molitierno ◽  
Gennaro Di Lauro
Keyword(s):  
Reinforced Concrete ◽  
Uniform Distribution ◽  
Design Method ◽  
Time History ◽  
Seismic Retrofit ◽  
Time History Analysis ◽  
Performance Criteria ◽  
Ductility Demand ◽  
History Analysis ◽  
Buckling Restrained Braces

Background: The seismic retrofitting of frame structures using hysteretic dampers is a very effective strategy to mitigate earthquake-induced risks. However, its application in current practice is rather limited since simple and efficient design methods are still lacking, and the more accurate time-history analysis is time-consuming and computationally demanding. Aims: This paper develops and applies a seismic retrofit design method to a complex real case study: An eight-story reinforced concrete residential building equipped with buckling-restrained braces. Methods: The design method permits the peak seismic response to be predicted, as well as the dampers to be added in the structure to obtain a uniform distribution of the ductility demand. For that purpose, a pushover analysis with the first mode load pattern is carried out. The corresponding story pushover curves are first idealized using a degrading trilinear model and then used to define the SDOF (Single Degree-of-Freedom) system equivalent to the RC frame. The SDOF system, equivalent to the damped braces, is designed to meet performance criteria based on a target drift angle. An optimal damper distribution rule is used to distribute the damped braces along the elevation to maximize the use of all dampers and obtain a uniform distribution of the ductility demand. Results: The effectiveness of the seismic retrofit is finally demonstrated by non-linear time-history analysis using a set of earthquake ground motions with various hazard levels. Conclusion: The results proved the design procedure is feasible and effective since it achieves the performance objectives of damage control in structural members and uniform ductility demand in dampers.

Test Study on Seismic Performance of Cantilevered Vertical Irregular Model Frame Structure

2014 ◽  
Vol 1065-1069 ◽  
pp. 1035-1041
Author(s):  
Si Tian Chen ◽  
Jie Xu ◽  
Hong Hui Xie
Keyword(s):  
Seismic Response ◽  
Shaking Table Test ◽  
Time History ◽  
Time History Analysis ◽  
Shaking Table ◽  
Frame Structure ◽  
Scaled Model ◽  
Influence Coefficients ◽  
History Analysis ◽  
Dynamic Time

This paper is a seismic response study on a vertical irregular frame structure which has a cantilevered top floor. Aimed to analyze the features of seismic response for a vertical irregular frame and scaled model, dynamic time history analysis and shaking table test have been carried out by use of the earthquake waves recorded in WENHUAN earthquake. It shows that the results of dynamic time history analysis and shaking table test are in good agreement, and the earthquake influence coefficients obtained by dynamic time history analysis and shaking table test are larger than the value according to Code, which indicates that the results would be not secure if the simplified methods specified in Code only in the sight of the calculation of earthquake loads.

Study on Design Measure of Seismic Capacity Design in R.C. Mega-Frame Structures

2013 ◽  
Vol 368-370 ◽  
pp. 1786-1793
Author(s):  
Hong Xia Duan ◽  
Shang Zhang
Keyword(s):  
Design Method ◽  
Plastic Hinge ◽  
Time History ◽  
Frame Structure ◽  
Amplification Coefficient ◽  
Seismic Capacity ◽  
Ground Floor ◽  
Elastic Plastic ◽  
Design Values ◽  
Earthquake Action

This paper explores the design method of several typical mega plane frames, with the variables being the combination of varying amplification coefficient of moment at bottom sections of ground floor columns of the secondary frame on the main beams. The elastic-plastic dynamic analysis program Drain-2d+ of the plane structure is used to carry out the elastic-plastic time-history analysis for each typical mega-frame under the earthquake action. Based on the analysis, the deformation characteristics of the mega-frame, the emerging of the plastic hinge and the weak point of the overall structure under the earthquake action is developed, from which the correct method of obtaining the design value of amplification coefficient of moments at bottom sections of ground floor columns of the secondary frame on the main beams is concluded. The reasonable design values are recommended as the basis to provide some suggestions for the design of the reinforced concrete mega-frame structure.

Anti-Seismic Behavior of Innovatory RC Frame Subjected to Severe Earthquake Action

2008 ◽  
Vol 400-402 ◽  
pp. 713-718
Author(s):  
Xiu Li Wang ◽  
Xiao Dong Li ◽  
Tao Li
Keyword(s):  
Seismic Behavior ◽  
Time History ◽  
Seismic Energy ◽  
Frame Structure ◽  
Rc Frame ◽  
Seismic Region ◽  
Concrete Frame ◽  
Stiffness Reduction ◽  
Buckling Restrained Braces ◽  
Earthquake Action

The anti-seismic behavior of RC frame with buckling restrained braces (BRBs) subjected to severe earthquake action in seismic region was investigated in this paper. A design process of the buckling restrained braces used for stiffness-deficiency concrete frame structures was given, the design of the buckling restrained braces was conducted for a common frame structure, the layout of these braces in it was given by taking an actual engineering for illustrations, and the static analysis and time-history dynamic analysis were also performed. The results of computation showed that the use of buckling restrained braces has led to several functional improvements, such as the increase in structure stiffness, reduction of story displacement, and improved energy dissipation ability when compared with the frame without such braces. Analysis results showed further that RC frame with BRBs could absorb and dissipate seismic energy more effectively, improving anti-seismic performance of the framed structure.

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